def in_data_exchange(self, data):
"""Sends a (Mifare) command to the currently active target.
The "data" parameter contains the command data as a bytearray.
Returns the data returned by the command (as a bytearray).
Raises an IOError if the command failed.
"""
logging.debug("InDataExchange sending: " + " ".join("{0:02X}".format(k)
for k in data))
logging.debug(data)
frame = Pn532Frame(
frame_type=PN532_FRAME_TYPE_DATA,
data=bytearray([PN532_COMMAND_INDATAEXCHANGE, 0x01]) + data)
self.send_command_check_ack(frame)
response_frame = self.read_response()
if response_frame.get_frame_type() == PN532_FRAME_TYPE_ERROR:
raise IOError("InDataExchange failed (error frame returned)")
response = response_frame.get_data()
logging.debug("InDataExchange response: " +
" ".join("{0:02X}".format(k) for k in response))
if response[1] != 0x00:
# Only the status byte was returned. There was an error.
if response[1] == 0x14:
raise IOError("Mifare authentication failed")
else:
raise IOError(
"InDataExchange returned error status: {0:#x}".format(
response[1]))
return response[2:]
def in_deselect(self):
"""Deselects the current target."""
logging.debug("InDeselect sending...")
frame = Pn532Frame(frame_type=PN532_FRAME_TYPE_DATA, data=bytearray([PN532_COMMAND_INDESELECT, 0x01]))
self.send_command_check_ack(frame)
response_frame = self.read_response()
if response_frame.get_frame_type() == PN532_FRAME_TYPE_ERROR:
raise IOError("InDeselect failed (error frame returned)")
response = response_frame.get_data()
logging.debug("InDeselect response: " + " ".join("{0:02X}".format(k) for k in response))
if response[1] != 0x00:
# Only the status byte was returned. There was an error.
raise IOError("InDataExchange returned error status: {0:#x}".format(response[1]))
def set_max_retries(self, mx_rty_passive_activation):
"""Configure the PN532 for the number of retries attempted
during the InListPassiveTarget operation (set to
MIFARE_SAFE_RETRIES for a safe one-time check, set to
MIFARE_WAIT_FOR_ENTRY so it waits until entry of a card).
"""
# We set MxRtyPassiveActivation to 5 because it turns out that one
# try sometimes does not detect the card properly.
frame = Pn532Frame(frame_type=PN532_FRAME_TYPE_DATA,
data=bytearray([PN532_COMMAND_RFCONFIGURATION,
PN532_RFCONFIGURATION_CFGITEM_MAXRETRIES,
0xFF, 0x01, mx_rty_passive_activation]))
self.send_command_check_ack(frame)
self.read_response()
def scan_field(self):
"""Scans the PN532's field for a Mifare card using the
InListPassiveTarget operation.
Returns the card's UID (a bytearray) if a card was in the field
or False if no card was in the field. Only one card is
detected at a time (the PN532 can handle two but this is not
implemented here). False is never returned if the number of
retries (see set_max_retries()) is set to MIFARE_WAIT_FOR_ENTRY.
"""
frame = Pn532Frame(frame_type=PN532_FRAME_TYPE_DATA,
data=bytearray([PN532_COMMAND_INLISTPASSIVETARGET, 0x01, 0x00]))
self.send_command_check_ack(frame)
response = self.read_response().get_data()
target_count = response[1]
if not target_count:
self._uid = False
return False
uid_length = response[6]
self._uid = response[7:7 + uid_length]
return self._uid
